linux – 在“ip link”或“ip addr”输出前面的索引

[weixin_38066019]

在ip link show或ip addr show输出中,每个网络接口前面都有一个索引.例如,从1到6： root@T42:~# ip link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:16:41:54:01:93 brd ff:ff:ff:ff:ff:ff 3: bond0: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff 4: irda0: <NOARP> mtu 2048 qdisc noop state DOWN qlen 8 link/irda 00:00:00:00 brd ff:ff:ff:ff 5: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:13:ce:8b:99:3e brd ff:ff:ff:ff:ff:ff 6: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 100 link/none root@T42:~# 现在,如果我删除一个接口(ip link del dev tun0)并创建一个接口(ip tuntap add mode tun),则使用新的索引： root@T42:~# ip link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:16:41:54:01:93 brd ff:ff:ff:ff:ff:ff 3: bond0: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff 4: irda0: <NOARP> mtu 2048 qdisc noop state DOWN qlen 8 link/irda 00:00:00:00 brd ff:ff:ff:ff 5: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:13:ce:8b:99:3e brd ff:ff:ff:ff:ff:ff 7: tun0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN qlen 500 link/none root@T42:~# 这些指数的目的是什么？有没有办法根据这些索引号进行排序？我的意思是,例如,如果我创建了大量的接口(例如对于{2..5000}中的i;执行brctl addbr br“$i”;完成),那么这些接口不按索引号排序： root@VM-host:~# ip link show | tail 1279: br1246: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT link/ether 02:de:92:e5:da:b8 brd ff:ff:ff:ff:ff:ff 1023: br990: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT link/ether c2:35:8b:3a:dd:fa brd ff:ff:ff:ff:ff:ff 767: br734: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT link/ether da:e9:52:8f:24:dd brd ff:ff:ff:ff:ff:ff 511: br478: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT link/ether 56:6d:81:a0:71:36 brd ff:ff:ff:ff:ff:ff 255: br222: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT link/ether a6:92:89:f1:ee:4f brd ff:ff:ff:ff:ff:ff root@VM-host:~#

[weixin_38090265]

这些数字仅仅是为了方便而且是动态计算的. These numbers are dynamically calculated, so should not be used to refer to the interfaces. 更多信息,你可以找到tools-ip-link和tools-ip-addr.